|Publication number||US7639944 B2|
|Application number||US 10/592,293|
|Publication date||Dec 29, 2009|
|Filing date||Jun 6, 2006|
|Priority date||Jul 6, 2005|
|Also published as||CN1893385A, CN100459553C, CN101160767A, EP1804406A1, EP1804406A4, US20080232802, WO2007003091A1|
|Publication number||10592293, 592293, PCT/2006/1224, PCT/CN/2006/001224, PCT/CN/2006/01224, PCT/CN/6/001224, PCT/CN/6/01224, PCT/CN2006/001224, PCT/CN2006/01224, PCT/CN2006001224, PCT/CN200601224, PCT/CN6/001224, PCT/CN6/01224, PCT/CN6001224, PCT/CN601224, US 7639944 B2, US 7639944B2, US-B2-7639944, US7639944 B2, US7639944B2|
|Original Assignee||Huawei Technologies Co., Ltd.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (9), Non-Patent Citations (7), Referenced by (6), Classifications (22), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to the filed of optical communication technologies, and particularly to a method for protecting a cross-ring service in an optical network.
The optical network topology has experienced an isolated node, a linear topology and a ring topology. At present, many networks have been provided with a topology of Mesh or quasi-Mesh Network. An optical Network 10 as shown in
Although the Mesh Network topology has been used in an optical network system for some time, the protections for a transport plane mainly are a linear protection and a ring protection. The protection for a cross-ring (i.e. a protection ring) service mostly adopts a DNI (Dual-Node Interconnection) method. However, this DNI method relatively wastes resources and also has certain demands on the network structure, that is, a dual-node interconnection is generally required, and the configuration thereof is relatively complicated.
Also, a method interconnecting rings with the Multiplex Section can provide such a protection. Generally, this method performs a service dual-transmission on interconnected local-ring nodes, and performs a selective reception on interconnected nodes at the same side of another ring. The configuration process for this method may be complicated which requires a manual configuration), and the bandwidth on a Multiplex Section ring may be occupied excessively (in particular when the interconnected nodes are not adjacent ones on the ring). Moreover, this solution may be only applicable for the case of a dual-node interconnection, and fail to provide an effective protection for the case where the rings are interconnected merely via a single node or share no common node.
The present invention provides a method for effectively protecting a cross-ring service in an optical network to overcome disadvantages of a low bandwidth utilization ratio and a strict requirement on the network topology in connection with the Dual-Node Interconnection method in the prior art used for the cross-ring service.
An embodiment of the present invention provides a method for protecting a cross-ring service in an optical network, wherein the method may include the steps of:
determining whether a configured working path crosses different rings; and
in the case that the working path crosses different rings, establishing a cross-ring protection path which bypasses an off-ring node or an on-ring node of the working path on a ring, and binding the cross-ring protection path and the working path.
Preferably, the method may further include the steps of:
selecting a first node, other than the off-ring node, on a first ring including a service transmitting node, and selecting a second node, other than the on-ring node, on a second ring including a service receiving node, wherein the first node and the second node are located on the working path;
establishing the cross-ring protection path with the first node being as an origination node and the second node being as a termination node; and
binding the cross-ring protection path and a corresponding protected section of the working path, wherein the origination node and the termination node of the protected section are respectively the first node and the second node, and the protected section includes the off-ring node or the on-ring node.
Preferably, the cross-ring protection path may be established through Resource Reservation Protocol-Traffic Engineering Protocol, Open Shortest Path First-Traffic Engineering Protocol or Intermediate System-Intermediate System-Traffic Engineering Protocol.
Preferably, the method may further include the step of:
a node for selectively receiving a service on the working path and the cross-ring protection path performing a transfer for a point of selectively receiving a service according to a ring switching status.
Preferably, in the case that the ring in which the node for a selective reception is located operates normally, the node for a selective reception may selectively receive a service on the working path and the cross-ring protection path.
Preferably, in the case that a section protection switching occurs to the ring in which the node for a selective reception is located, the node for a selective reception may selectively receive a service on an on-ring identical-direction protection path in the and the cross-ring protection path.
Preferably, in the case that a ring protection switching occurs to the ring in which the node for a selective reception is located, the node for a selective reception may selectively receive a service on an on-ring opposite-direction protection path in the and the cross-ring protection path.
Preferably, a 1+1 or 1:1 protection may be adopted for the working path and the cross-ring protection path.
Preferably, the working path may cross rings interconnected via a single node or dual nodes or without a common node.
According to the method for protecting a cross-ring service in an optical network in the embodiments of the present invention, with an establishment of a cross-ring protection path and a binding between the cross-ring protection path and a working path, a protection can be implemented for a service crossing rings interconnected via a single node. Moreover in comparison with the conventional Dual-Node Interconnection, the embodiments of the present invention can reduce the occupancy of bandwidth resource on the Multiplex Section and improve the bandwidth utilization ratio. In addition, the embodiments of the present invention can provide a protection for a service crossing rings interconnected via dual nodes or without an interconnecting node, thus enabling an effective protection for a cross-ring service in an optical network.
The present invention will be further described hereinafter with reference to the drawings and the embodiments so as to make the principle, characteristics and advantages thereof more apparent.
As shown in
Transport Plane 33 includes transport network nodes 331 which are switching entities and interconnected through Sub Network Connection 332. Transport Plane 33 generally performs the functions of connecting/disconnecting, switching (routing), transporting and the like so as to provide a unidirectional or bi-directional information transport from one end point to another as well as a transport of some control information and network management information.
Control Plane 32 performs the functions of call control, connection control and the like within an intelligent optical network. Control Plane 32 is supported by a signaling network and includes a plurality of functional components, such as a group of communication entities, Control Unit 322 (e.g. an optical connection controller) and a corresponding internal network node interface 324. The communication entities and Control Unit 322 respectively compose a plurality of Management Domains 321 interconnected via an external network node interface 323. The communication entities and Control Units 322 are primarily used for transferring a transport network resource and provide the functions related to establishing, maintaining and disconnecting (releasing the network resource) a connection. Among these functions, the functions of signaling and routing are the most important. In addition, Control Plane 32 is also connected to Request Proxy 36 via UNI (User Network Interface). A method for protecting a cross-ring service according to an embodiment of the present invention is implemented by Control Plane 32.
Management Plane 31 manages Control Plane 32 and Transport Plane 33. While managing an optical transport network and the nodes 331, Management Plane 31 provides an efficient communication function between a network operation system and the nodes 331.
It can be assumed that a service goes via four nodes A, E, G and J. The service can obtain a good protection respectively in the first ring and the second ring. For example, when fiber section AE in the first ring breaks, a service protection can be implemented via ABE, or when node G in the second ring fails, a service protection can be implemented via EFHIJ. However, if interconnecting node E fails, the service can not obtain a good protection. The service cannot be protected even with a Dual-Node Interconnection (DNI) method, because there is one common node E between the two rings.
If the service transmitting node and the service receiving node are located in the same ring, it goes to step S65 of planning a Multiplex Section protection respectively within the two rings, otherwise Control Plane 32 plans a cross-ring protection route at two adjacent nodes on the working path on both sides of node E that interconnects the two rings (through RSVP-TE, OSPF-TE or ISIS-TE Protocol), establishes a cross-ring protection path bypassing node E based upon a practical use status of bandwidth, and binds the cross-ring protection path and a corresponding section of the working path, wherein the corresponding section of the working path and the cross-ring protection path have the same origination node and include node E (step S63), as will be described in detail with reference to
Practically, if AB and BG have available bandwidth resources, then the first node may be node A, the second node may be node G, and the cross-ring protection path may be path ABG. In addition to the first node and the second node, the cross-ring protection path can include a plurality of intermediate nodes. The configuration for the protection path can be achieved through such techniques as OSPF-TE (Open Shortest Path First-Traffic Engineering) or the like based upon constraint information of each link, the use status of bandwidth and the like
In addition, when the service is transported through rings which are adjacent indirectly, the service protection can also be achieved through the above method. The difference is that the off-ring node and the on-ring node are not coincident.
It can be assumed that the cross-ring protection path is path AFG, and a dual-transmission of the service can be performed at node A, and a selective reception of the service can be performed at node G. When the common node E of the first ring and the second ring fails, path AFG may take the place of path AEG for a service path switching.
When a section switching or ring switching occurs due to a failure of section EG for the second multiplex ring EFHIJG, a transfer for a point selectively receiving the service may be required, that is, node G is required to select a high-quality service for a selective reception from the service on protection channel E-F-H-I-J-G corresponding to working path EG after the switching and the service on path AFG, as detailed process in
Therefore, node G receives selectively the services in
As shown in
The present invention has been described and illustrated by way of the embodiments of the present invention with reference to the drawings, it shall be recognized by those skilled in the art that those embodiments and drawings are merely illustrative and not restrictive, that the present invention shall be not limited thereto, and that various modifications and variations can be made thereto in light of the descriptions and the drawings without departing from the sprit and scope of the present invention as defined by the accompanying claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US5491686||Nov 18, 1994||Feb 13, 1996||Fujitsu Limited||Composite ring network having an increased redundancy for restoring communication path|
|US7035206 *||May 4, 2001||Apr 25, 2006||Emulex Design & Manufacturing Corporation||Automatic isolation in loops|
|US7167444 *||Dec 29, 1999||Jan 23, 2007||At&T Corp.||Family ring protection technique|
|US20030063617 *||Oct 31, 2002||Apr 3, 2003||Limaye Pradeep Shrikrishna||Robust mesh transport network comprising conjoined rings|
|US20030147354||Feb 4, 2002||Aug 7, 2003||General Instrument Corporation||Extendable slot addressing system and method|
|US20050265365 *||May 11, 2005||Dec 1, 2005||Huaixue Wan||Ring bearing network and method of implementing service bearing thereof|
|CN1189269A||Jun 18, 1996||Jul 29, 1998||艾利森电话股份有限公司||Self-healing network|
|CN1379936A||Mar 27, 2000||Nov 13, 2002||纽约市哥伦比亚大学托管会||Network switch for failure restoration|
|EP1217775A2||Dec 12, 2001||Jun 26, 2002||Nortel Networks Limited||Shared protection in an optical network|
|1||Demetrios Stamatelakis, et al; "IP Layer Restoration and Network Planning Based on Virtual Protection Cycles", IEEE Journal on Selected Areas in Communications, IEEE Service Center, Piscataway, US, vol. 18, No. 10, Oct. 2000, XP011055237.|
|2||European Search Report dated Mar. 28, 2008; Application No./Patent No. 06742110.7-2415 PCT/CN2006/001224.|
|3||International Search Report issued for PCT/CN2006/001224, dated Aug. 24, 2006.|
|4||J. Roldan, et al; "Application of Dual-Access Architecture, with Drop and Continue Feature, to WDM Optical Networks", Technology and Infrastructure, XX, XX, Jun. 23, 1998, pp. 259-266, XP002161771.|
|5||J.J. Shi, et al; "Analysis and design of survivable telecommunications networks", IEE Proceedings: Communications, Institution of Electrical Engineers, GB, vol. 144, No. 5, Oct. 14, 1997, pp. 322-330 XP006008480.|
|6||Ramesh Bhandari; "Optimal Physical Diversity Algorithms and Survivable Networks", Computers and Communications, 1997. Proceedings, Second IEEE Symposium on Alexandria, Egypt, Jul. 1-3, 1997, Los Alamitos, CA, USA, IEEE Comput. Soc, US, Jul. 1, 1997, pp. 433-441; XP010241387.|
|7||Xi Yang, et al; "Survivable Lightpath Provisioning in WDM Mesh Networks Under Shared Path Protection and Signal Quality Constraints", Journal of Lightwave Technology, XX, XX vol. 23, No. 4, Apr. 2005, pp. 1556-1567, XP011130780.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8203932 *||Nov 25, 2009||Jun 19, 2012||Electronics And Telecommunications Research Institute||Method and system for protection switching in ethernet ring|
|US8977123 *||Aug 17, 2012||Mar 10, 2015||Nec Laboratories America, Inc.||2-step-optimization procedure for routing and wavelength assignment with combined dedicated shared protections in multi-cable multi-fiber optical WDM networks|
|US9246627 *||Aug 17, 2012||Jan 26, 2016||Nec Laboratories America, Inc.||Joint optimization procedure for routing and wavelength assignment with combined dedicated shared protections in multi-cable multi-fiber optical WDM networks|
|US20100135154 *||Nov 25, 2009||Jun 3, 2010||Electronics And Telecommunications Research Institute||Method and system for protection switching in ethernet ring|
|US20130216224 *||Aug 17, 2012||Aug 22, 2013||Nec Laboratories America, Inc.||Joint Optimization Procedure for Routing and Wavelength Assignment with Combined Dedicated Shared Protections in Multi-Cable Multi-Fiber Optical WDM Networks|
|US20130216225 *||Aug 17, 2012||Aug 22, 2013||Nec Laboratories America, Inc.||2-Step-Optimization Procedure for Routing and Wavelength Assignment with Combined Dedicated Shared Protections in Multi-Cable Multi-Fiber Optical WDM Networks|
|U.S. Classification||398/3, 398/59, 398/5|
|Cooperative Classification||H04J14/0227, H04J14/0289, H04J14/0284, H04Q2011/0081, H04J14/0294, H04J14/0286, H04J14/0283, H04Q11/0062, H04J14/0295, H04Q2011/0092|
|European Classification||H04J14/02N4, H04J14/02N6, H04J14/02N5, H04J14/02P6S, H04Q11/00P4, H04J14/02P6D, H04J14/02M, H04J14/02P4|
|Dec 1, 2006||AS||Assignment|
Owner name: HUAWEI TECHNOLOGIES CO., LTD., CHINA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WANG, GUANGJUN;REEL/FRAME:018571/0537
Effective date: 20061101
|Nov 9, 2010||CC||Certificate of correction|
|Mar 11, 2013||FPAY||Fee payment|
Year of fee payment: 4